问题描述

我的 C++ MFC 代码中有一个 HWND，我想将此 HWND 传递给 C# 控件并将其作为 IntPtr 获取.

I have a HWND in my C++ MFC code, and I want to pass this HWND to a C# control and get it as IntPtr.

我的代码有什么问题，我该如何正确处理?(我认为使用 CLI 指针有问题，因为我收到一个错误，它无法从 System::IntPtr^ 转换为 System::IntPtr.但我不知道如何让这一切正常工作...)

What Is wrong in my code, and how can I do it correctly? (I think it's something with wrong using of the CLI pointers, because I get an error that it cannot convert from System::IntPtr^ to System::IntPtr. But I don't know how exactly to make it all to work properly...)

我的 C++ MFC 代码:

My C++ MFC code:

HWND myHandle= this->GetSafeHwnd();
m_CLIDialog->UpdateHandle(myHandle);

我的 C# 代码:

public void UpdateHandle(IntPtr mHandle)
{
   ......
}

我的 CLI 代码:

void CLIDialog::UpdateHandle(HWND hWnd)
{
   System::IntPtr^ managedhWnd = gcnew System::IntPtr();
   HWND phWnd; // object on the native heap

   try
   {

       phWnd = (HWND)managedhWnd->ToPointer();
        *phWnd = *hWnd; //Deep-Copy the Native input object to Managed wrapper.

       m_pManagedData->CSharpControl->UpdateHandle(managedhWnd);
    }

m_pManagedData->CSharpControl->UpdateHandle(managedhWnd);

如果我将 CLI 代码更改为:

if I change the CLI code to:

void CLIDialog::UpdateHandle(HWND hWnd)
{
   System::IntPtr managedhWnd;
   HWND phWnd; // object on the native heap

   try
   {

       phWnd = (HWND)managedhWnd.ToPointer();
        *phWnd = *hWnd; //Deep-Copy the Native input object to Managed wrapper.

       m_pManagedData->CSharpControl->UpdateHandle(managedhWnd);
    }

所以在这种情况下，在 C# 中得到的值是 0.

So in this case the value gotten in C# is 0.

我怎样才能让它正常工作?

How can I make it work properly?

推荐答案

要从 HWND(它只是一个指针)转换为 IntPtr 你只需要调用它的构造函数，你不需要 gcnew 因为它是一个值类型.所以这应该可以将 HWND 从本地传递到托管:

To convert from HWND (which is just a pointer) to IntPtr you just have to invoke it's constructor, and you do not need gcnew as it's a value type. So this should work to pass a HWND from native to managed:

void CLIDialog::UpdateHandle( HWND hWnd )
{
  IntPtr managedHWND( hwnd );
  m_pManagedData->CSharpControl->UpdateHandle( managedHWND );
}

这是一个您可以从托管代码调用并从本机代码中获取本机 HWND 的函数:

And this is a function you can invoke from managed code and get a native HWND from in native code:

void SomeManagedFunction( IntPtr hWnd )
{
  HWND nativeHWND = (HWND) hWnd.ToPointer();
  //...
}

这篇关于将 HWND 转换为 IntPtr (CLI)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！